It's because career-oriented people don't have time for a lot of kids. Usually society's impression of people who have a lot of kids is that they're uneducated & have nothing better to do than pop out kids. NO OFFENSE TO ANYONE FROM A LG FAMILY & I DIDN'T SAY I THOUGHT THAT, I SAID SOCIETY. Teacher or not, I'd love to just have one pair of boy/girl twins, then I would have one of each gender. Two at the most would be enough for me & they'd be the same age & grow up together. Plus, I'd raise them to be close. I have a good chance of having twins because if I marry & have kids by my bf, he's an identical twin & my aunt had twin boys, plus my dad had twin siblings.